RT Journal Article
SR Electronic
T1 The analysis of visual motion: a comparison of neuronal and psychophysical performance
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 4745
OP 4765
DO 10.1523/JNEUROSCI.12-12-04745.1992
VO 12
IS 12
A1 Britten, KH
A1 Shadlen, MN
A1 Newsome, WT
A1 Movshon, JA
YR 1992
UL http://www.jneurosci.org/content/12/12/4745.abstract
AB We compared the ability of psychophysical observers and single cortical neurons to discriminate weak motion signals in a stochastic visual display. All data were obtained from rhesus monkeys trained to perform a direction discrimination task near psychophysical threshold. The conditions for such a comparison were ideal in that both psychophysical and physiological data were obtained in the same animals, on the same sets of trials, and using the same visual display. In addition, the psychophysical task was tailored in each experiment to the physiological properties of the neuron under study; the visual display was matched to each neuron's preference for size, speed, and direction of motion. Under these conditions, the sensitivity of most MT neurons was very similar to the psychophysical sensitivity of the animal observers. In fact, the responses of single neurons typically provided a satisfactory account of both absolute psychophysical threshold and the shape of the psychometric function relating performance to the strength of the motion signal. Thus, psychophysical decisions in our task are likely to be based upon a relatively small number of neural signals. These signals could be carried by a small number of neurons if the responses of the pooled neurons are statistically independent. Alternatively, the signals may be carried by a much larger pool of neurons if their responses are partially intercorrelated.